1230021009 has 48 divisors (see below), whose sum is σ = 2155870080. Its totient is φ = 659704320.

The previous prime is 1230020999. The next prime is 1230021011. The reversal of 1230021009 is 9001200321.

It is a happy number.

It is not a de Polignac number, because 1230021009 - 2¹² = 1230016913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1230020982 and 1230021000.

It is not an unprimeable number, because it can be changed into a prime (1230021049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 447379 + ... + 450119.

It is an arithmetic number, because the mean of its divisors is an integer number (44913960).

Almost surely, 2^1230021009 is an apocalyptic number.

It is an amenable number.

1230021009 is a deficient number, since it is larger than the sum of its proper divisors (925849071).

1230021009 is a wasteful number, since it uses less digits than its factorization.

1230021009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3190 (or 3187 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 1230021009 is about 35071.6553501542. The cubic root of 1230021009 is about 1071.4473699026.

The spelling of 1230021009 in words is "one billion, two hundred thirty million, twenty-one thousand, nine".